Positive temperature coefficient polymer composition and positive temperature coefficient circuit protection device
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United States of America Patent
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Oct 15, 2013
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Jul 3, 2012
filing date -
Jul 3, 2012
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Abstract
A PTC polymer composition includes a polymer component, and an electrically conductive filler component including an electro-conductive metallic particulate, an electro-conductive ceramic particulate, and an electro-conductive carbon particulate. The weight ratio of the polymer component to the filler component ranges from 1:13˜1:5.5. The weight of the metallic particulate is higher than that of the ceramic particulate, and the weight of the ceramic particulate is higher than that of the carbon particulate. The carbon particulate is present in an amount ranging from 2.8 wt % to 7.3 wt % based on the weight of the filler component.
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